After entering the background, the contributor kept showing loading and could not contribute. Only some people had this situation. There was no problem when I used their account to log in my computer, I would like to know the reason.
The version of OJS that you’re using is no longer supported by PKP. I recommend that you upgrade to the newest version of OJS, as it is possible that your issue will be resolved by upgrading. However, other community members may wish to offer assistance.
When we had this problem a few years ago with an earlier OJS version (sorry, don’t remember which) we tracked it to a Chinese firewall blocking Google content delivery servers. When we set “enable_cdn = Off” in config.inc.php, the problem went away.